US3723471A - Novel benzopyran derivatives - Google Patents

Novel benzopyran derivatives Download PDF

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Publication number
US3723471A
US3723471A US00112764A US3723471DA US3723471A US 3723471 A US3723471 A US 3723471A US 00112764 A US00112764 A US 00112764A US 3723471D A US3723471D A US 3723471DA US 3723471 A US3723471 A US 3723471A
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Prior art keywords
dione
cyclohexane
reduction
benzopyran
alkyl
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US00112764A
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English (en)
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U Eder
G Sauer
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Bayer Pharma AG
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Schering AG
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    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D311/00—Heterocyclic compounds containing six-membered rings having one oxygen atom as the only hetero atom, condensed with other rings
    • C07D311/02—Heterocyclic compounds containing six-membered rings having one oxygen atom as the only hetero atom, condensed with other rings ortho- or peri-condensed with carbocyclic rings or ring systems
    • C07D311/74—Benzo[b]pyrans, hydrogenated in the carbocyclic ring
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C45/00—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds
    • C07C45/006—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by hydrogenation of aromatic hydroxy compounds
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C45/00—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds
    • C07C45/61—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by reactions not involving the formation of >C = O groups
    • C07C45/67—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by reactions not involving the formation of >C = O groups by isomerisation; by change of size of the carbon skeleton
    • C07C45/68—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by reactions not involving the formation of >C = O groups by isomerisation; by change of size of the carbon skeleton by increase in the number of carbon atoms
    • C07C45/72—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by reactions not involving the formation of >C = O groups by isomerisation; by change of size of the carbon skeleton by increase in the number of carbon atoms by reaction of compounds containing >C = O groups with the same or other compounds containing >C = O groups
    • C07C45/73—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by reactions not involving the formation of >C = O groups by isomerisation; by change of size of the carbon skeleton by increase in the number of carbon atoms by reaction of compounds containing >C = O groups with the same or other compounds containing >C = O groups combined with hydrogenation
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C49/00—Ketones; Ketenes; Dimeric ketenes; Ketonic chelates
    • C07C49/385—Saturated compounds containing a keto group being part of a ring
    • C07C49/403—Saturated compounds containing a keto group being part of a ring of a six-membered ring

Definitions

  • ABSTRACT Benzopyrans of the formula wherein R is lower-alkyl are useful as intermediates in the production of steroids, e.g., 4,9( l0)-estradiene- 3,17-dione.
  • the reaction mixture is then worked up in the usual manner, preferably after acidification.
  • R in the above compounds contains one to six'carbon atoms, e.g., methyl, ethyl, propyl, butyl. Preferred are those wherein R is methyl or ethyl.
  • the process of this invention is a two-stage process.
  • lower-alkyl vinyl ketone is condensed with cyclohexane-l ,3 -dione.
  • This addition reaction per se is known.
  • the reaction is conducted in the presence of a basic catalyst.
  • LN. Nazarov and 8.1. Zavyalor (Isvest. Ak'd. Nauk SSSR, Otdel. Khim. Nauk 1957, 207; CA. 51, 1957, 11302 a) describe the reaction of methylvinyl ketone with cyclohexane-l,3-dione in an alkaline solution.
  • the main reaction product is 2,2-bis(3-oxobutyl)-cyclohexane-l,3-dione, whereas the desired product, viz., 2-(3-oxobutyl)- cyclohexane-1,3-dione is isolated in a yield of only about 30 percent.
  • both components can be dissolved in water, the solution stored at room temperature for about 5-30 hours, and the reaction mixture worked up in the usual manner, e.g., by extracting the aqueous phase with an organic solvent, e.g., chloroform, and concentrating the organic phase under vacuum.
  • an organic solvent e.g., chloroform
  • This simple method of preparation can, of course, also be varied, e.g., by conducting the reaction at an elevated temperature, but preferably not substantially above 60 C.; by adding a polar solvent to the reaction mixture, e.g., methanol or acetone, as a solubilizer; and by conducting the reaction in the absence of atmospheric oxygen so as to avoid undesired side reactions, for example, by storing the reaction mixture under an inert gas atmosphere, e.g., nitrogen.
  • a polar solvent e.g., methanol or acetone
  • the second stage of the process of this invention is the reduction of the thus-produced 2-(3-oxoalkyl)- cyclohexane-l,3-diones. None has been known heretofore about this reduction. Since these compounds contain three keto groups, it would be expected that the reduction step would yield mixtures of various possible partial reduction products and/or the corresponding trihydroxy compound.
  • 2-(3-oxo-alkyl)-c.yclohexane-l,3-diones can be selectively reduced to the corresponding 2-(3-hydroxyalkyl)- cyclohexane-l ,3-diones, with reducing agents customarily employed for the reduction of keto groups.
  • the thus-formed 2-(3-hydroxyalkyl)-cyclohexane-1,3- diones then are directly rearranged, in the presence of acids, into the benzopyran derivatives of Formula I.
  • Suitable reducing agents which can be employed for the selective reduction of 2-(3-oxoalkyl)- cyclohexane-l,3-diones are hydrogen in the presence of ordinary metal catalysts, e.g., Raney nickel, platinum oxide, or palladium catalysts, as well as the conventional metal hydrides, e.g., sodium borohydride and lithium aluminum hydride.
  • ordinary metal catalysts e.g., Raney nickel, platinum oxide, or palladium catalysts
  • the conventional metal hydrides e.g., sodium borohydride and lithium aluminum hydride.
  • the reduction is preferably conducted in an alkaline solution, e.g., an aqueous or alcoholic solution of sodi- V um. hydroxide.
  • the benzopyrans of Formula I are valuable intermediates for the synthesis of pharmacologically effective substances, especially steriod hormones of the androstane and pregnane series, especially the 19-nor-steroids.
  • benzopyran derivatives of Formula I As an example of the use of benzopyran derivatives of Formula I, described below is the synthesis of 4,9(l)-estradiene-3,l7-dione, which compound is an important key substance for the preparation of numerous pharmacologically active steroids, e.g., estrone, estradiol, equilin, testosterone, l7a-ethynyl-l9-nortestosterone, etc.
  • This compound can be prepared in a simple manner as follows:
  • This compound is converted, by hydrogenation of the A-double bond and subsequent isomerization of the A -double bond with acid, into 3-methyl-4-oxa-5 (l0),9-estradien-l7-one, which is converted, by chromic acid oxidation in an acidic solution, into 4,5- seco-9( l0)-estrene-3,5,l7-trione.
  • This seco compound is cyclized with acid to produce 4,9(10)-estradiene- 3,17-dione.
  • This compound is converted with a vinyl magnesium halide into 5- hydroxy-2-ethyl-5-vinyl-2,3,4,6,7,8-hexahydro-(5)- benzopyran which is also converted, in the manner described above into 4-methyl-4,9(10)-estradiene- 3,17-dione.
  • the solution is agitated under vacuum at 3040 C., then saturated with sodium chloride, extracted with chloroform, and the organic phase is dried with sodium sulfate. After the solvent has been distilled off under vacuum, an oil is obtained in a quantitative yield; this oil is readily crystallized and, after recrystallization from ether, yields 2-(3-oxobutyl)-cyclohexane-l,3- dione, melting point -104 C.
  • the mixture is gradually acidified to a pH of 5-6 with glacial acetic acid under cooling; then the solvent is extensively distilled off under vacuum, and, after the reaction mixture has been taken up in water, a pH of l-2 is produced with concentrated hydrochloric acid.
  • the solution is saturated with sodium chloride, shaken out with chloroform, and the organic phase is washed with solution of bicarbonate and water. After drying with sodium sulfate and distilling off the solvent under vacuum, a crude product is obtained yielding, after being distilled once under vacuum, 3.5 g. of pure crystalline 2-methyl-2,3,4,6,7,8- hexahydro-[5H]-benzopyran-5-one, m.p. 29-30 C.
  • reaction mixture is stirred for another 4 hours under the above-mentioned conditions.
  • the reaction solution is mixed with concentrated hydrochloric acid until a pH of 1-2 is reached, saturated with sodium chloride, and extracted with chloroform.
  • the organic phase is washed with bicarbonate solution and water, dried with sodium sulfate, and evaporated. After distilling under vacuum, 290 g. of 2-methyl-2,3,4,6,7,8 -hexahydro-[5H]- benzopyran-S-one is obtained, which compound is produced in the pure form and crystallizes when allowed to stand; m.p. 29-30 C.
  • EXAMPLE 3 Converting of 2-methyl-2,3,4,6,7,8-hexahydro-(5H)- benzopyran-S-one to 4,9(l0)-estradiene-3,17-dione and to estrone
  • a solution of 40 g 2-methyl-2,3,4,6,7,8-hexahydro- (5H)-benzopyran-5 -one in 200 ml of tetrahydrofuran is added to a vinyl magnesium chloride solution (obtained from 24 g magnesium turnings, 150 ml of tetrahydrofuran and vinyl chloride), which is cooled to -30 C.Thereafter, the reaction mixture is agitated for 30 minutes and than worked up in the usual manner.
  • the seco compound obtained is dissolved in 500 ml of benzene, mg p-toluene sulfonic acid are added and the mixture boiled at a water separator for l5 minutes.
  • 0.5 g of palladium calcium carbonate catalyst is added to the cooled mixture and the mixture is hydrogenated with the theoretical amount of hydrogen under normal pressure. Then, the catalyst is filtered off, the solution is evaporated under vacuum and the residue is subjected to chromatography on silica gel.
  • the 3-methyl-4-oxa-5( l0),9(l l )-estradiene-l7-one such obtained is dissolved in 150 ml of dioxane, 15 ml of 2 n sulfuric acid are added and the mixture is refluxed. After complete reaction the mixture is poored into water, extracted with chloroform and the chloroform solution evaporated under vacuum to dryness. The crude residue is dissolved in 100 ml of acetone, ml of Jones reagent (that is 8 11 solution of chromic acid in aquous sulfuric acid) are added and the mixture reacted for minutes. Thenthe mixture is poured into water, extracted with chloroform and the chloroform solution is concentrated under vacuum.
  • the 4,5-seco-9(10)-estrene-3,5,l7-trione such obtained is dissolved in 75 ml of ethanol, 7.5 ml of 4 n sulfuric acid are added, the mixture is refluxed for one hour and than worked up in the usual manner.
  • the 4,9(10)-estradiene-3,l7-dione such obtained is dissolved in 100 ml of methanol, 500 mg of palladium magnesium oxide catalyst are added and the mixture is refluxed for 3 hours. The catalyst is filtered off, the solution is concentrated under vacuum and the residue obtained is recrystallized from methanol. There are thus obtained 10.3 g estrone of the melting point 245-247C.
  • a compound of claim 1 2-methyl-2,3,4,6,7,8-hexahydro-[5H]-benzopyran-5-one.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)
  • Steroid Compounds (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
US00112764A 1970-02-06 1971-02-04 Novel benzopyran derivatives Expired - Lifetime US3723471A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE702006372A DE2006372C3 (de) 1970-02-06 1970-02-06 Verfahren zur Herstellung von Hexahydrobenzopyran-Derivaten

Publications (1)

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US3723471A true US3723471A (en) 1973-03-27

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Country Status (12)

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US (1) US3723471A (de)
AT (1) AT301543B (de)
BE (1) BE762568A (de)
CH (1) CH547795A (de)
CS (1) CS172340B2 (de)
DE (1) DE2006372C3 (de)
DK (1) DK126324B (de)
ES (1) ES387227A1 (de)
FR (1) FR2078235A5 (de)
GB (1) GB1341622A (de)
NL (1) NL7101514A (de)
SE (1) SE384862B (de)

Also Published As

Publication number Publication date
DE2006372A1 (de) 1971-08-19
DE2006372B2 (de) 1978-06-29
DK126324B (da) 1973-07-02
CH547795A (de) 1974-04-11
ES387227A1 (es) 1973-12-16
CS172340B2 (de) 1976-12-29
BE762568A (fr) 1971-08-05
GB1341622A (en) 1973-12-25
FR2078235A5 (de) 1971-11-05
SE384862B (sv) 1976-05-24
DE2006372C3 (de) 1979-03-08
NL7101514A (de) 1971-08-10
AT301543B (de) 1972-09-11

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